Identifying the Chassis Harness Assembly

There are three slightly different chassis harness assemblies and Apple service strategy varies with the type of chassis. The three chassis harness assemblies differ according to the combination of floppy and CD-ROM drives they support.

Chassis 922-1824 supports the auto-insert Apple SuperDrive and CD-ROM drives earlier than the 300i+. This chassis requires a floppy drive adapter, and the CD-ROM connector bridge is about 1-1/2 inches above the CD-ROM drive bay.

Chassis 922-0557 supports the manual-insert Apple SuperDrive and CD-ROM drives earlier than the 300i+. This chassis uses a ribbon cable to connect the floppy drive, and the CD-ROM connector bridge is about 1-1/2 inches above the CD-ROM drive bay.

Chassis 661-1094 supports the manual-insert Apple SuperDrive and the 300i+ CD-ROM drive. This chassis uses a ribbon cable to connect the floppy drive, but the CD-ROM connector bridge is only 1/2 inch above the CD-ROM drive bay.

First remove the EMI shields.

Caution: The speaker wire connections on the chassis cable bridge are very fragile. Avoid removing or replacing the speaker wires unless you need to replace the chassis or have isolated the problem to the speaker wires. (That is, replace and test the speakers, front panel control board, and analog board first.)

1 Disconnect the speaker wire spade connector from the back of the speaker.

2 Remove the Phillips screws from the front of the speaker.

Replacement Note: Detach the replacement speaker from its wires and connect the replacement speaker to the original speaker wires.

Speaker Wires

Note: The speaker wire connectors are very fragile.

1 Look down on the chassis cable bridge and locate the notches in the cable bridge on top of the wire connectors.

2 Using a jeweler's screwdriver, very gently press down on the tab in the middle of the wire connector. You will feel or hear a snap.

3 Slide out the wire connector.

Replacement Note: The analog board slides into the computer and completes the connection to the speaker wires; thus, the speaker wire connectors must sit securely in the cable bridge.

4 Slide the speaker wire connector into its position in the cable bridge and press up until the connector is secure. You may need to use a jeweler's screw driver to adjust the small metal tab in the center of the speaker wire connector.